According to the passage, how do mangrove root systems protect coastal settlements?
The estuarine mangrove forests of the Gulf of Guinea, spanning coastal Ghana, Nigeria, and Cameroon, provide indispensable ecosystem services that protect littoral populations against catastrophic climatic shocks. Mangrove root matrices, comprising subterranean prop roots and aerial pneumatophores, act as natural hydrodynamic baffles that attenuate incoming storm surges and dissipate tidal wave energy. Also, these saline intertidal wetlands serve as critical nurseries for over eighty percent of commercial pelagic fish species, providing juvenile fry with shelter from apex oceanic predators. Despite their ecological paramountcy, coastal mangroves have declined drastically due to unregulated charcoal harvesting and urban shoreline dredging, threatening both artisanal fisheries and coastal geomorphic stability.
Answer and explanation
Correct answer: A. By dissipating tidal wave energy and buffering against severe storm surges.
- Step 1: Locate the specific detail in the passage regarding the hydrodynamic function of mangrove roots. The text states: 'Mangrove root matrices, comprising subterranean prop roots and aerial pneumatophores, act as natural hydrodynamic baffles that attenuate incoming storm surges and dissipate tidal wave energy.'
- Step 2: Match this explicit statement to the options: dissipating tidal wave energy and buffering against severe storm surges directly mirrors the text.
Answer
By dissipating tidal wave energy and buffering against severe storm surges.
Why not the others: By absorbing toxic chemical waste and turning seawater into freshwater fabricates desalinization and chemical absorption claims absent from the text; By preventing commercial ships from entering sovereign coastal harbours invents a navigational blockade function not mentioned; By producing timber suitable for heavy oceanic dockyard pilings describes timber exploitation rather than coastal defense, and the passage actually notes unregulated harvesting harms mangroves.
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